2138532397 has 2 divisors, whose sum is σ = 2138532398. Its totient is φ = 2138532396.

The previous prime is 2138532379. The next prime is 2138532491. The reversal of 2138532397 is 7932358312.

Together with previous prime (2138532379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2012509321 + 126023076 = 44861^2 + 11226^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138532397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138532377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069266198 + 1069266199.

It is an arithmetic number, because the mean of its divisors is an integer number (1069266199).

Almost surely, 2^2138532397 is an apocalyptic number.

It is an amenable number.

2138532397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138532397 is an equidigital number, since it uses as much as digits as its factorization.

2138532397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 2138532397 is about 46244.2688016580. The cubic root of 2138532397 is about 1288.3640895926.

The spelling of 2138532397 in words is "two billion, one hundred thirty-eight million, five hundred thirty-two thousand, three hundred ninety-seven".